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A configurable high frequency Gm-C filter using a novel linearized Gm

Karami, P ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.aeue.2019.06.029
  3. Publisher: Elsevier GmbH , 2019
  4. Abstract:
  5. A large-signal linearization method for operational transconductance amplifiers (OTA) using a combination of cross-coupled quadratic cell and a novel non-linear current injection technique is presented in this paper. Post-layout simulations show that for 180 nm CMOS process with a 1.8 V power supply, total harmonic distortion (THD) at 1.5 V peak-to-peak and 5 kHz input is less than −46 dB. Also, the dynamic range (DR) at given THD is 68 dB with power consumption of 0.64 mW. To verify the performance, the proposed OTA is used to design a new configurable filter in high-frequency range using N-path filter methodology. Universal Butterworth Gm-C active filters are embedded in the proposed 4-path filter, which makes it possible to change the type and order of the filter by means of four digital bits. The center frequency of the proposed 4-path filter can be tuned from 100 MHz to 3.5 GHz. The final filter is designed to achieve a voltage gain of 0 dB, in-band input third-order intercept point (IIP3) of +2.5 dBm and a total NF of 2.6 dB. Post-layout simulation results of the first-order filter show a THD of −44 dB with a 5 kHz input tone and 614 mV peak-to-peak swing. © 2019 Elsevier GmbH
  6. Keywords:
  7. Configurable N-path filter ; Cross-coupled quad ; Large-signal linearization ; Operational transconductance amplifier (OTA) ; Active filters ; Butterworth filters ; Linearization ; Transconductance ; Cross-coupled ; First-order filters ; High frequency HF ; Input third-order intercept points ; Large-signals ; Linearization methods ; Post layout simulation ; Total harmonic distortion (THD) ; Operational amplifiers
  8. Source: AEU - International Journal of Electronics and Communications ; Volume 109 , 2019 , Pages 55-66 ; 14348411 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S143484111930771X